The picture below shows a centre-pivot irrigation system - NSC Agricultural Technology - Question 6 - 2020 - Paper 1
Question 6
The picture below shows a centre-pivot irrigation system.
6.1.1 The irrigation system above requires force to drive the wheels. Name TWO of these drive methods.
6.... show full transcript
Worked Solution & Example Answer:The picture below shows a centre-pivot irrigation system - NSC Agricultural Technology - Question 6 - 2020 - Paper 1
Step 1
6.1.1 The irrigation system above requires force to drive the wheels. Name TWO of these drive methods.
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Answer
Mechanical
Hydraulic (Hydrostatic)
Step 2
6.1.2 Name a method to protect the metal parts of the irrigation system against corrosion.
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Answer
Galvanizing.
Step 3
6.1.3 Give a reason why the water pressure is kept constant from the centre of the pivot to the end of the pivot.
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Answer
To ensure that the amount of water administered to the crop is equal from the centre of the land to the outer edge, allowing for an equal distribution of water.
Step 4
6.1.4 Name a device that a farmer can install to automatically switch the system on or off, as required.
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Answer
An irrigation timer or regulator.
Step 5
6.2 Give THREE reasons for the use of water scheduling.
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To save water.
To prevent over irrigation.
To ensure crop variety.
Step 6
6.3 Name TWO types of equipment that can be used to measure crop evapotranspiration effectively.
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Tensiometer/Neutron Moisture Probe
Evaporation pan.
Step 7
6.4.1 Identify A, B, C, D and E shown in the diagram above.
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Answer
A – Inlet pipe
B – Scum/Foam
C – Sewage water/Liquid
D – Sludge/Solid waste
E – Outlet pipe.
Step 8
6.4.2 Describe the main function of the bacteria that are present in the system.
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To break down the solid materials.
Step 9
6.4.3 Explain the precautionary measures that have to be taken into consideration when a septic tank is built.
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Not near boreholes or drinking water installations.
A suitable distance away from the house.
Not near traffic.
Not near where people eat, wash or work regularly.
Not inside flood area of a river.
Not uphill from settlements.
No leaks in system.
Step 10
6.5 Identify the water drainage system shown below.
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Channel drain/furrow drain.
Step 11
6.6 Briefly explain how water is purified by reverse osmosis.
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The water is sent through two different liquids separated by a permeable membrane.
The permeable membrane allows only water to pass through on a molecular level.
The water flows through the system, leaving all impurities behind.
Step 12
6.7 Name TWO communication systems that can be used to monitor the grazing patterns of livestock.
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GPS collar.
Video live-feed via Wi-Fi/CCTV/drones.
Step 13
6.8 Rearrange the following steps in the integration of data by a Geographical Information System in the correct order:
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Install yield monitors and measuring devices on harvesting equipment.
The yield data from the monitor is recorded and stored at regular intervals.
Geographical Information System software takes the yield data and produces yield maps.
